Spaces dashboard inline editor saves non existent box to space overrides

Boxes 6.x-1.0
Context 6.x-3.0

Using the dashboard inline editor, the user adds custom boxes to an editable region.

Problem occurs when the user positions the box, adds description, title and body, and then clicks the save button on the dashboard editor, rather than saving the box with the boxes save button first. The box is added as a context reaction block to the space overrides, but is not actually created.

If the region is otherwise empty, and contains only this non existent box (hidden with the "context-block-hidden" class), the region is not shown for further dashboard editing. Reverting the spaces-dashboard overrides is the only way I can see to clear this.

I can reproduce this on Atrium-1-0-beta8 too (screen shot).